I have a setup with a raspberry pi and two DS18B20 digital thermometers that measure the temperature of the ambient air and the water in a swamp cooler that I place my fermentation chamber in. I was alerted to the fact that measuring the swamp cooler water was a poor way to estimate the temperature of the actual fermenting beer.
I have ordered a third DS18B20 and I want to measure the actual beer temperature. I want to see if there are any correlation between the ambient, swamp water, and beer temperatures. In order to accomplish this I wish to have the DS18B20 measuring the beer directly -- I do not want to put an insulation material on the outside of the fermentation chamber (however, since this method is commonly done, I think I will order another probe and see how well it correlates to the probe in the beer).
What I would like is ideas on how to best accomplish this while keeping everything air tight.
I will be using buckets as opposed to carboys for this experiment.
I plan to continually update the numbers to this if anyone else has any interest.